David S. Peterson
Phosphating on Differing Surfaces
Question: Is a smooth surface better for phosphating or a rough one?
Read MoreOxidation Under Paint
Question: We clean our steel parts and use a phosphating process for pretreatment.
Read MoreIn Search of a Polymeric Coating
Question: I have an application that needs a 0.005-0.006-inch thick insulative coating on an aluminum sheet metal part.
Read MoreFree and Total Acid Values
Question: Can anyone tell me what is the meaning of total acid and free acid?
Read MorePassivate Stainless Steel
Question: I have been told that it is not necessary to passivate 316 S.S., but that 303 and 304 must be to provide a corrosion resistant surface.
Read MoreGear Media
Gear Media Question: I have heard the term, “gear media” and I wonder what this is.
Read MoreTotal and Free Acid Values
Question: Can anyone tell me what is the meaning of total acid and free acid?
Read MorePassivating Brass Shell Cases after Pickling/Polishing
Question: I am running a mass finishing process that requires an aqueous passivation of the brass as a final process to help prevent corrosion.
Read MoreCleaning Copper Parts
Question: Some of our copper parts, which have been cleaned but not protected by a chemical reagent but cased by vacuum bag, take on a bad appearance after three days.
Read MoreVibratory Finishing
Question: Is there any rule of thumb for how many parts to put in a vibratory machine?
Read MoreParticle Counters
Question: We have seen a number of our customers switch from a washdown weight and visual particle count to a laser particle counter.
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